The ‘Ua’u or Hawaiian Petrel is an endangered species once thought extinct or nearly so. But in recent decades, biologists have relocated some of their well-hidden nests — such as underneath the lava fields of Mauna Loa, an active volcano. Areas where the lava has long since cooled have deep tubes in which the ‘Ua’u can make their burrows. Despite their secretive burrows, the ‘Ua’u are still at risk of predators such as feral cats. A fence completed in 2016 keeps predators away from the petrel burrows, giving them a space to thrive.

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